# US 10,770,105 B2 · Magnetic tape having characterized magnetic layer and magnetic tape device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,105 B2 - Document ID: US10770105B2 - Status: Granted - Kind: B2 - Application number: 16/038,514 - Filed: 2018-07-18 - Published: 2019-01-24 - Granted: 2020-09-08 - Earliest claimed: 2017-07-19 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Norihito Kasada - Web page: https://patentgrep.com/patent/US10770105B2 ## CPC - G11B 5/70678: {Ferrites} - G11B 5/70: on a base layer - G11B 5/702: characterised by the bonding agent - G11B 5/708: characterised by addition of non-magnetic particles to the layer - G11B 5/735: characterised by the back layer {(magnetic recording media substrates G11B5/739)} - H01F 1/113: in a bonding agent - H01F 1/348: {Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape. ## Claims ### Claim 1 A magnetic tape comprising: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, wherein a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00. ### Claim 2 (depends on 1) The magnetic tape according to claim 1, wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90. ### Claim 3 (depends on 1) The magnetic tape according to claim 1, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 4 (depends on 2) The magnetic tape according to claim 2, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 5 (depends on 1) The magnetic tape according to claim 1, further comprising: a back coating layer including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer. ### Claim 6 A magnetic tape device comprising: a magnetic tape, a magnetic head and a servo head, wherein the magnetic tape is a magnetic tape comprising: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, wherein a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00. ### Claim 7 (depends on 6) The magnetic tape device according to claim 6, wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90. ### Claim 8 (depends on 6) The magnetic tape device according to claim 6, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 9 (depends on 7) The magnetic tape device according to claim 7, wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm. ### Claim 10 (depends on 6) The magnetic tape device according to claim 6, wherein the magnetic tape further comprises a back coating layer including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer.